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How Anti-Trade Nativism Wrecked the Ancient Greeks - WSJ

Fast forward to today’s world. As in the past, Americans face a choice. We can erect trade barriers and build walls—and stoke bad will among nations. Or we can continue on the road to peace and prosperity by maximizing free trade in goods, ideas and people (vetted for national security) while offering a plan to bring back prosperity for those in need without re-erecting trade barriers.
Our leaders need to make the case for the second path, clearly and fearlessly. In short, we need smart, tough and responsible leadership. Otherwise, make way for Cleon—demagogues, nativists and protectionists who risk stoking a new conflict. That could make the Peloponnesian War look tame by comparison.